[deliverable/linux.git] / drivers / gpu / drm / tegra / output.c

/*
 * Copyright (C) 2012 Avionic Design GmbH
 * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/of_gpio.h>

#include <drm/drm_panel.h>
#include "drm.h"

static int tegra_connector_get_modes(struct drm_connector *connector)
{
	struct tegra_output *output = connector_to_output(connector);
	struct edid *edid = NULL;
	int err = 0;

	/*
	 * If the panel provides one or more modes, use them exclusively and
	 * ignore any other means of obtaining a mode.
	 */
	if (output->panel) {
		err = output->panel->funcs->get_modes(output->panel);
		if (err > 0)
			return err;
	}

	if (output->edid)
		edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
	else if (output->ddc)
		edid = drm_get_edid(connector, output->ddc);

	drm_mode_connector_update_edid_property(connector, edid);

	if (edid) {
		err = drm_add_edid_modes(connector, edid);
		kfree(edid);
	}

	return err;
}

static int tegra_connector_mode_valid(struct drm_connector *connector,
				      struct drm_display_mode *mode)
{
	struct tegra_output *output = connector_to_output(connector);
	enum drm_mode_status status = MODE_OK;
	int err;

	err = tegra_output_check_mode(output, mode, &status);
	if (err < 0)
		return MODE_ERROR;

	return status;
}

static struct drm_encoder *
tegra_connector_best_encoder(struct drm_connector *connector)
{
	struct tegra_output *output = connector_to_output(connector);

	return &output->encoder;
}

static const struct drm_connector_helper_funcs connector_helper_funcs = {
	.get_modes = tegra_connector_get_modes,
	.mode_valid = tegra_connector_mode_valid,
	.best_encoder = tegra_connector_best_encoder,
};

static enum drm_connector_status
tegra_connector_detect(struct drm_connector *connector, bool force)
{
	struct tegra_output *output = connector_to_output(connector);
	enum drm_connector_status status = connector_status_unknown;

	if (output->ops->detect)
		return output->ops->detect(output);

	if (gpio_is_valid(output->hpd_gpio)) {
		if (gpio_get_value(output->hpd_gpio) == 0)
			status = connector_status_disconnected;
		else
			status = connector_status_connected;
	} else {
		if (!output->panel)
			status = connector_status_disconnected;
		else
			status = connector_status_connected;

		if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
			status = connector_status_connected;
	}

	return status;
}

static void drm_connector_clear(struct drm_connector *connector)
{
	memset(connector, 0, sizeof(*connector));
}

static void tegra_connector_destroy(struct drm_connector *connector)
{
	drm_sysfs_connector_remove(connector);
	drm_connector_cleanup(connector);
	drm_connector_clear(connector);
}

static const struct drm_connector_funcs connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.detect = tegra_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = tegra_connector_destroy,
};

static void drm_encoder_clear(struct drm_encoder *encoder)
{
	memset(encoder, 0, sizeof(*encoder));
}

static void tegra_encoder_destroy(struct drm_encoder *encoder)
{
	drm_encoder_cleanup(encoder);
	drm_encoder_clear(encoder);
}

static const struct drm_encoder_funcs encoder_funcs = {
	.destroy = tegra_encoder_destroy,
};

static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
{
	struct tegra_output *output = encoder_to_output(encoder);
	struct drm_panel *panel = output->panel;

	if (mode != DRM_MODE_DPMS_ON) {
		drm_panel_disable(panel);
		tegra_output_disable(output);
	} else {
		tegra_output_enable(output);
		drm_panel_enable(panel);
	}
}

static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
				     const struct drm_display_mode *mode,
				     struct drm_display_mode *adjusted)
{
	return true;
}

static void tegra_encoder_prepare(struct drm_encoder *encoder)
{
}

static void tegra_encoder_commit(struct drm_encoder *encoder)
{
}

static void tegra_encoder_mode_set(struct drm_encoder *encoder,
				   struct drm_display_mode *mode,
				   struct drm_display_mode *adjusted)
{
	struct tegra_output *output = encoder_to_output(encoder);
	int err;

	err = tegra_output_enable(output);
	if (err < 0)
		dev_err(encoder->dev->dev, "tegra_output_enable(): %d\n", err);
}

static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
	.dpms = tegra_encoder_dpms,
	.mode_fixup = tegra_encoder_mode_fixup,
	.prepare = tegra_encoder_prepare,
	.commit = tegra_encoder_commit,
	.mode_set = tegra_encoder_mode_set,
};

static irqreturn_t hpd_irq(int irq, void *data)
{
	struct tegra_output *output = data;

	drm_helper_hpd_irq_event(output->connector.dev);

	return IRQ_HANDLED;
}

int tegra_output_probe(struct tegra_output *output)
{
	struct device_node *ddc, *panel;
	enum of_gpio_flags flags;
	int err, size;

	if (!output->of_node)
		output->of_node = output->dev->of_node;

	panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
	if (panel) {
		output->panel = of_drm_find_panel(panel);
		if (!output->panel)
			return -EPROBE_DEFER;

		of_node_put(panel);
	}

	output->edid = of_get_property(output->of_node, "nvidia,edid", &size);

	ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
	if (ddc) {
		output->ddc = of_find_i2c_adapter_by_node(ddc);
		if (!output->ddc) {
			err = -EPROBE_DEFER;
			of_node_put(ddc);
			return err;
		}

		of_node_put(ddc);
	}

	output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
						   "nvidia,hpd-gpio", 0,
						   &flags);
	if (gpio_is_valid(output->hpd_gpio)) {
		unsigned long flags;

		err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
				       "HDMI hotplug detect");
		if (err < 0) {
			dev_err(output->dev, "gpio_request_one(): %d\n", err);
			return err;
		}

		err = gpio_to_irq(output->hpd_gpio);
		if (err < 0) {
			dev_err(output->dev, "gpio_to_irq(): %d\n", err);
			gpio_free(output->hpd_gpio);
			return err;
		}

		output->hpd_irq = err;

		flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
			IRQF_ONESHOT;

		err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
					   flags, "hpd", output);
		if (err < 0) {
			dev_err(output->dev, "failed to request IRQ#%u: %d\n",
				output->hpd_irq, err);
			gpio_free(output->hpd_gpio);
			return err;
		}

		output->connector.polled = DRM_CONNECTOR_POLL_HPD;
	}

	return 0;
}

int tegra_output_remove(struct tegra_output *output)
{
	if (gpio_is_valid(output->hpd_gpio)) {
		free_irq(output->hpd_irq, output);
		gpio_free(output->hpd_gpio);
	}

	if (output->ddc)
		put_device(&output->ddc->dev);

	return 0;
}

int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
{
	int connector, encoder;

	switch (output->type) {
	case TEGRA_OUTPUT_RGB:
		connector = DRM_MODE_CONNECTOR_LVDS;
		encoder = DRM_MODE_ENCODER_LVDS;
		break;

	case TEGRA_OUTPUT_HDMI:
		connector = DRM_MODE_CONNECTOR_HDMIA;
		encoder = DRM_MODE_ENCODER_TMDS;
		break;

	case TEGRA_OUTPUT_DSI:
		connector = DRM_MODE_CONNECTOR_DSI;
		encoder = DRM_MODE_ENCODER_DSI;
		break;

	case TEGRA_OUTPUT_EDP:
		connector = DRM_MODE_CONNECTOR_eDP;
		encoder = DRM_MODE_ENCODER_TMDS;
		break;

	default:
		connector = DRM_MODE_CONNECTOR_Unknown;
		encoder = DRM_MODE_ENCODER_NONE;
		break;
	}

	drm_connector_init(drm, &output->connector, &connector_funcs,
			   connector);
	drm_connector_helper_add(&output->connector, &connector_helper_funcs);
	output->connector.dpms = DRM_MODE_DPMS_OFF;

	if (output->panel)
		drm_panel_attach(output->panel, &output->connector);

	drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
	drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);

	drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
	drm_sysfs_connector_add(&output->connector);

	output->encoder.possible_crtcs = 0x3;

	return 0;
}

int tegra_output_exit(struct tegra_output *output)
{
	return 0;
}
Commit	Line	Data
d8f4a9ed TR	1	/*
	2	* Copyright (C) 2012 Avionic Design GmbH
	3	* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
d8f4a9ed	10	#include <linux/of_gpio.h>
d8f4a9ed	11
9be7d864	12	#include <drm/drm_panel.h>
d8f4a9ed TR	13	#include "drm.h"
	14
	15	static int tegra_connector_get_modes(struct drm_connector *connector)
	16	{
	17	struct tegra_output *output = connector_to_output(connector);
	18	struct edid *edid = NULL;
	19	int err = 0;
	20
acde5413 TR	21	/*
	22	* If the panel provides one or more modes, use them exclusively and
	23	* ignore any other means of obtaining a mode.
	24	*/
9be7d864 TR	25	if (output->panel) {
	26	err = output->panel->funcs->get_modes(output->panel);
	27	if (err > 0)
	28	return err;
	29	}
	30
d8f4a9ed TR	31	if (output->edid)
	32	edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
	33	else if (output->ddc)
	34	edid = drm_get_edid(connector, output->ddc);
	35
	36	drm_mode_connector_update_edid_property(connector, edid);
	37
	38	if (edid) {
	39	err = drm_add_edid_modes(connector, edid);
	40	kfree(edid);
	41	}
	42
	43	return err;
	44	}
	45
	46	static int tegra_connector_mode_valid(struct drm_connector *connector,
	47	struct drm_display_mode *mode)
	48	{
	49	struct tegra_output *output = connector_to_output(connector);
	50	enum drm_mode_status status = MODE_OK;
	51	int err;
	52
	53	err = tegra_output_check_mode(output, mode, &status);
	54	if (err < 0)
	55	return MODE_ERROR;
	56
	57	return status;
	58	}
	59
	60	static struct drm_encoder *
	61	tegra_connector_best_encoder(struct drm_connector *connector)
	62	{
	63	struct tegra_output *output = connector_to_output(connector);
	64
	65	return &output->encoder;
	66	}
	67
	68	static const struct drm_connector_helper_funcs connector_helper_funcs = {
	69	.get_modes = tegra_connector_get_modes,
	70	.mode_valid = tegra_connector_mode_valid,
	71	.best_encoder = tegra_connector_best_encoder,
	72	};
	73
	74	static enum drm_connector_status
	75	tegra_connector_detect(struct drm_connector *connector, bool force)
	76	{
	77	struct tegra_output *output = connector_to_output(connector);
	78	enum drm_connector_status status = connector_status_unknown;
	79
6b6b6042 TR	80	if (output->ops->detect)
	81	return output->ops->detect(output);
	82
d8f4a9ed TR	83	if (gpio_is_valid(output->hpd_gpio)) {
	84	if (gpio_get_value(output->hpd_gpio) == 0)
	85	status = connector_status_disconnected;
	86	else
	87	status = connector_status_connected;
	88	} else {
9be7d864 TR	89	if (!output->panel)
	90	status = connector_status_disconnected;
	91	else
	92	status = connector_status_connected;
	93
d8f4a9ed TR	94	if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
	95	status = connector_status_connected;
	96	}
	97
	98	return status;
	99	}
	100
f002abc1 TR	101	static void drm_connector_clear(struct drm_connector *connector)
	102	{
	103	memset(connector, 0, sizeof(*connector));
	104	}
	105
d8f4a9ed TR	106	static void tegra_connector_destroy(struct drm_connector *connector)
	107	{
	108	drm_sysfs_connector_remove(connector);
	109	drm_connector_cleanup(connector);
f002abc1	110	drm_connector_clear(connector);
d8f4a9ed TR	111	}
	112
	113	static const struct drm_connector_funcs connector_funcs = {
	114	.dpms = drm_helper_connector_dpms,
	115	.detect = tegra_connector_detect,
	116	.fill_modes = drm_helper_probe_single_connector_modes,
	117	.destroy = tegra_connector_destroy,
	118	};
	119
f002abc1 TR	120	static void drm_encoder_clear(struct drm_encoder *encoder)
	121	{
	122	memset(encoder, 0, sizeof(*encoder));
	123	}
	124
d8f4a9ed TR	125	static void tegra_encoder_destroy(struct drm_encoder *encoder)
	126	{
	127	drm_encoder_cleanup(encoder);
f002abc1	128	drm_encoder_clear(encoder);
d8f4a9ed TR	129	}
	130
	131	static const struct drm_encoder_funcs encoder_funcs = {
	132	.destroy = tegra_encoder_destroy,
	133	};
	134
	135	static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
	136	{
9be7d864 TR	137	struct tegra_output *output = encoder_to_output(encoder);
	138	struct drm_panel *panel = output->panel;
	139
b5190022 TR	140	if (mode != DRM_MODE_DPMS_ON) {
	141	drm_panel_disable(panel);
	142	tegra_output_disable(output);
	143	} else {
	144	tegra_output_enable(output);
	145	drm_panel_enable(panel);
9be7d864	146	}
d8f4a9ed TR	147	}
	148
	149	static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
	150	const struct drm_display_mode *mode,
	151	struct drm_display_mode *adjusted)
	152	{
	153	return true;
	154	}
	155
	156	static void tegra_encoder_prepare(struct drm_encoder *encoder)
	157	{
	158	}
	159
	160	static void tegra_encoder_commit(struct drm_encoder *encoder)
	161	{
	162	}
	163
	164	static void tegra_encoder_mode_set(struct drm_encoder *encoder,
	165	struct drm_display_mode *mode,
	166	struct drm_display_mode *adjusted)
	167	{
	168	struct tegra_output *output = encoder_to_output(encoder);
	169	int err;
	170
	171	err = tegra_output_enable(output);
	172	if (err < 0)
	173	dev_err(encoder->dev->dev, "tegra_output_enable(): %d\n", err);
	174	}
	175
	176	static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
	177	.dpms = tegra_encoder_dpms,
	178	.mode_fixup = tegra_encoder_mode_fixup,
	179	.prepare = tegra_encoder_prepare,
	180	.commit = tegra_encoder_commit,
	181	.mode_set = tegra_encoder_mode_set,
	182	};
	183
	184	static irqreturn_t hpd_irq(int irq, void *data)
	185	{
	186	struct tegra_output *output = data;
	187
	188	drm_helper_hpd_irq_event(output->connector.dev);
	189
	190	return IRQ_HANDLED;
	191	}
	192
59d29c0e	193	int tegra_output_probe(struct tegra_output *output)
d8f4a9ed	194	{
9be7d864	195	struct device_node ddc, panel;
d8f4a9ed	196	enum of_gpio_flags flags;
7236aa03	197	int err, size;
d8f4a9ed TR	198
	199	if (!output->of_node)
	200	output->of_node = output->dev->of_node;
	201
9be7d864 TR	202	panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
	203	if (panel) {
	204	output->panel = of_drm_find_panel(panel);
	205	if (!output->panel)
	206	return -EPROBE_DEFER;
	207
	208	of_node_put(panel);
	209	}
	210
d8f4a9ed TR	211	output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
	212
	213	ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
	214	if (ddc) {
	215	output->ddc = of_find_i2c_adapter_by_node(ddc);
	216	if (!output->ddc) {
	217	err = -EPROBE_DEFER;
	218	of_node_put(ddc);
	219	return err;
	220	}
	221
	222	of_node_put(ddc);
	223	}
	224
d8f4a9ed TR	225	output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
	226	"nvidia,hpd-gpio", 0,
	227	&flags);
d8f4a9ed TR	228	if (gpio_is_valid(output->hpd_gpio)) {
	229	unsigned long flags;
	230
	231	err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
	232	"HDMI hotplug detect");
	233	if (err < 0) {
	234	dev_err(output->dev, "gpio_request_one(): %d\n", err);
	235	return err;
	236	}
	237
	238	err = gpio_to_irq(output->hpd_gpio);
	239	if (err < 0) {
	240	dev_err(output->dev, "gpio_to_irq(): %d\n", err);
59d29c0e TR	241	gpio_free(output->hpd_gpio);
59d29c0e TR	242	return err;
d8f4a9ed TR	243	}
	244
	245	output->hpd_irq = err;
	246
	247	flags = IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING \|
	248	IRQF_ONESHOT;
	249
	250	err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
	251	flags, "hpd", output);
	252	if (err < 0) {
	253	dev_err(output->dev, "failed to request IRQ#%u: %d\n",
	254	output->hpd_irq, err);
59d29c0e TR	255	gpio_free(output->hpd_gpio);
59d29c0e TR	256	return err;
d8f4a9ed TR	257	}
	258
	259	output->connector.polled = DRM_CONNECTOR_POLL_HPD;
	260	}
	261
59d29c0e TR	262	return 0;
	263	}
	264
	265	int tegra_output_remove(struct tegra_output *output)
	266	{
	267	if (gpio_is_valid(output->hpd_gpio)) {
	268	free_irq(output->hpd_irq, output);
	269	gpio_free(output->hpd_gpio);
	270	}
	271
	272	if (output->ddc)
	273	put_device(&output->ddc->dev);
	274
	275	return 0;
	276	}
	277
	278	int tegra_output_init(struct drm_device drm, struct tegra_output output)
	279	{
	280	int connector, encoder;
	281
d8f4a9ed TR	282	switch (output->type) {
	283	case TEGRA_OUTPUT_RGB:
	284	connector = DRM_MODE_CONNECTOR_LVDS;
	285	encoder = DRM_MODE_ENCODER_LVDS;
	286	break;
	287
edec4af4 TR	288	case TEGRA_OUTPUT_HDMI:
	289	connector = DRM_MODE_CONNECTOR_HDMIA;
	290	encoder = DRM_MODE_ENCODER_TMDS;
	291	break;
	292
dec72739 TR	293	case TEGRA_OUTPUT_DSI:
	294	connector = DRM_MODE_CONNECTOR_DSI;
	295	encoder = DRM_MODE_ENCODER_DSI;
	296	break;
	297
6b6b6042 TR	298	case TEGRA_OUTPUT_EDP:
	299	connector = DRM_MODE_CONNECTOR_eDP;
	300	encoder = DRM_MODE_ENCODER_TMDS;
	301	break;
	302
d8f4a9ed TR	303	default:
	304	connector = DRM_MODE_CONNECTOR_Unknown;
	305	encoder = DRM_MODE_ENCODER_NONE;
	306	break;
	307	}
	308
	309	drm_connector_init(drm, &output->connector, &connector_funcs,
	310	connector);
	311	drm_connector_helper_add(&output->connector, &connector_helper_funcs);
f8c33255	312	output->connector.dpms = DRM_MODE_DPMS_OFF;
d8f4a9ed	313
9be7d864 TR	314	if (output->panel)
	315	drm_panel_attach(output->panel, &output->connector);
	316
d8f4a9ed TR	317	drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
	318	drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);
	319
	320	drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
	321	drm_sysfs_connector_add(&output->connector);
	322
	323	output->encoder.possible_crtcs = 0x3;
	324
	325	return 0;
d8f4a9ed TR	326	}
	327
	328	int tegra_output_exit(struct tegra_output *output)
	329	{
d8f4a9ed TR	330	return 0;
d8f4a9ed TR	331	}